<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>Document</title>

    <style>
        h1 {
            font-size: 40px;
            /* text-decoration: line-through underline overline; */

            /* text-decoration-line: overline;
            text-decoration-color: aqua;
            text-decoration-style: dashed; */


            /* css3相当于把文本修饰改成了复合属性 */
            text-decoration: overline red dashed;
        }
    </style>
</head>
<body>

    <h1>你好啊，欢迎学习前端知识</h1>
    
</body>
</html>